floor
, floorf
, floorl
Calculates the floor of a value.
Syntax
double floor(
double x
);
float floor(
float x
); // C++ only
long double floor(
long double x
); // C++ only
float floorf(
float x
);
long double floorl(
long double x
);
#define floor(X) // Requires C11 or higher
Parameters
x
Floating-point value.
Return value
The floor
functions return a floating-point value that represents the largest integer that is less than or equal to x
. There's no error return.
Input | SEH exception | _matherr exception |
---|---|---|
± QNaN, IND | none | _DOMAIN |
floor
has an implementation that uses Streaming SIMD Extensions 2 (SSE2). For information and restrictions about using the SSE2 implementation, see _set_SSE2_enable
.
Remarks
C++ allows overloading, so you can call overloads of floor
that take and return float
and long double
values. In a C program, unless you're using the <tgmath.h> macro to call this function, floor
always takes and returns a double
.
If you use the <tgmath.h> floor()
macro, the type of the argument determines which version of the function is selected. See Type-generic math for details.
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Requirements
Function | Required header |
---|---|
floor , floorf , floorl |
<math.h> |
floor macro |
<tgmath.h> |
For more compatibility information, see Compatibility.
Example
// crt_floor.c
// This example displays the largest integers
// less than or equal to the floating-point values 2.8
// and -2.8. It then shows the smallest integers greater
// than or equal to 2.8 and -2.8.
#include <math.h>
#include <stdio.h>
int main( void )
{
double y;
y = floor( 2.8 );
printf( "The floor of 2.8 is %f\n", y );
y = floor( -2.8 );
printf( "The floor of -2.8 is %f\n", y );
y = ceil( 2.8 );
printf( "The ceil of 2.8 is %f\n", y );
y = ceil( -2.8 );
printf( "The ceil of -2.8 is %f\n", y );
}
The floor of 2.8 is 2.000000
The floor of -2.8 is -3.000000
The ceil of 2.8 is 3.000000
The ceil of -2.8 is -2.000000
See also
Math and floating-point support
ceil
, ceilf
, ceill
round
, roundf
, roundl
fmod
, fmodf
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